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Gas concentration measuring device and method

A technology of gas concentration measurement and temperature detection circuit, which is applied in the direction of measuring device, measuring heat, analyzing gas mixture, etc., can solve the problems of large temperature control dispersion, large influence of exhaust gas temperature change, low gas concentration measurement accuracy, etc. The effect of improving measurement accuracy and eliminating the influence of concentration measurement

Active Publication Date: 2021-03-19
SHENZHEN SENSOR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have large dispersion of temperature control and are greatly affected by changes in exhaust gas temperature, resulting in low gas concentration measurement accuracy and cannot meet higher emission control requirements.

Method used

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  • Gas concentration measuring device and method

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Embodiment Construction

[0024] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0025] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be used for fixation as well as for coupling or communication.

[0026] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in ...

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Abstract

The invention provides a gas concentration measuring device. The device comprises a heating wire with temperature resistance characteristics, a temperature detection circuit, a heating power supply, atemperature measurement current source and a control unit; the heating wire is connected with the temperature detection circuit and the heating power supply through wires; the control unit is connected with the temperature detection circuit, the heating power supply and the temperature measurement current source; the heating power supply performs pulse type electrifying heating on the heating wire; the temperature measurement current source provides temperature measurement current for the heating wire during the electrifying interval of the heating power supply; and the temperature detectioncircuit collects an electric signal representing the temperature of the heating wire from the heating wire when the temperature measurement current source works, and feeds back the electric signal tothe control unit; the control unit adjusts the output of the heating power supply according to the electric signal to control the temperature of the heating wire so as to control the temperature of the gas concentration measuring device. The gas concentration measuring device can accurately control the heating of a chip, so that the temperature of the chip is kept constant, the influence of tail gas temperature change on concentration measurement is eliminated, and the measurement precision is remarkably improved.

Description

technical field [0001] The invention relates to gas concentration measurement technology, in particular to a gas concentration measurement device and method. Background technique [0002] Due to the needs of environmental protection and energy saving, fuel engines need to measure the concentration of oxygen, NOx, etc. in the exhaust gas. At present, the feasible measurement sensitive devices are chips based on zirconia ceramics. Ceramic chips, as the core components of high-temperature gas sensors, have a wide range of applications. application. [0003] Under the high temperature condition of 500-900 degrees, the zirconia ceramic chip allows oxygen ions to pass through but has good blocking characteristics for electrons and other ions. Based on this characteristic, a Nernst battery is made to realize the measurement of oxygen or NOx concentration; To ensure the accuracy of the measurement, the chip needs to be kept at a constant temperature. Existing oxygen sensors general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01K13/00H05B3/02H05B3/54
CPCG01N33/0004G01K13/00H05B3/02H05B3/54Y02A50/20
Inventor 李纯钢
Owner SHENZHEN SENSOR TECH CO LTD
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